000			02893nab a2200277 i 4500
003			BR-BrBNA
005			20230925101218.0
008			230814b2020 bl.ar|pooa||| 00| 0 eng |
040			_aBR-BrBNA _beng
072			_aH60 _b0150
100			_aOliveira Neto, A.M.
100			_aGuerra, N.
100			_aNoldin, J.A.
245			_aOff-season management with herbicides as an alternative to reduce weed infestation in paddy rice production systems
500			_aPublicação on-line; 28 ref.; 7 tables; Summary (En)
520			_aABSTRACT Background: Weed management is a challenge in paddy rice production, mainly due to the dispersal of a population resistant to herbicides. Objective: To assess the efficacy of chemical weed control in the offseason to reduce weedy rice and other species in water-seeded or drilled rice. Methods: Two experiments were carried out in a flat field to water-seeded or drilled rice, in randomized block design. The water-seeded system treatments were organized in a split-plot design. In the plot were evaluated two water management in the off-season (with or without continuous flooding), and in the subplot nine herbicides-treatments were evaluated (Check, clomazone at 0.72 and 1.08 kg a.i. ha-1, oxadiazon at 1.00 and 1.50 kg a.i. ha-1, oxyfluorfen at 0.312 and 0.48 kg a.i. ha-1, S-metolachlor at 1.44 kg a.i. ha-1, and flumioxazin a 0.075 kg a.i. ha-1). In the drilled rice experiment, the treatments were organized in a two-factor factorial. The factor A was nine herbicides treatments (the same herbicide and rates applied in water-seeded experiment) and the factor B was two application time (73 and 43 days before of rice-sowing). Results: Off-season management was efficient to reduce weedy rice infestation only on the paddy rice system using the pre-germinated seeds. In this assay, flumioxazin was an efficient alternative to giant arrowhead control, however the selectivity of this herbicide treatment needs to be studied. In dry-seeded system, herbicide sprayed in off-season reduced barnyardgrass infestation until the paddy rice sowing. Conclusions: The off-season management was efficient to reduce weedy rice and giant arrowhead infestation in water-seeded system, and barnyardgrass infestation in drill-seeded system. Keywords: drill-seeded water-seeded residual herbicides pre-germinated Oryza sativa
650			_aHERBICIDA
650			_aERVA DANINHA
650			_aCONTROLE QUÍMICO
650			_aORYZA SATIVA
650			_aARROZ
773	0		_0886 _91817 _dLondrina-PR : Sociedade Brasileira da Ciência das Plantas Daninhas, 1978 _o2023-031024 _tPlanta Daninha (Brazil) _x0100-8358; 1806-9681 (on-line) _gv. 38 p. 1-8; (2020) _wBR2023000862
856			_uhttps://www.scielo.br/j/pd/a/rsxpdY9QrVdFkMTq5mJXmKF/?format=pdf&lang=en
942			_cAnalítica
999			_c9811 _d9811